济阳坳陷古近系孔店组高频韵律旋回沉积记录及成因

doi:10.11743/ogg20150108

石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (1): 61-72.doi: 10.11743/ogg20150108

济阳坳陷古近系孔店组高频韵律旋回沉积记录及成因

谭先锋^1,2, 蒋艳霞³, 李洁⁴, 薛伟伟², 李泽民²

1. 复杂油气田勘探开发重庆市重点实验室, 重庆 401331;
2. 重庆科技学院石油与天然气工程学院, 重庆 401331;
3. 成都理工大学地球科学学院, 四川成都 610059;
4. 国土资源部页岩气资源勘查重点实验室, 重庆 400042;
5. 重庆市页岩气资源与勘查工程技术研究中心, 重庆 400042

收稿日期:2014-11-20 修回日期:2014-12-08 出版日期:2015-02-08 发布日期:2015-02-11
作者简介:谭先锋(1982-), 男, 博士、副教授, 沉积地质与古环境.E-mail:xianfengtan8299@163.com
基金资助:
国家自然科学基金项目(41202043);重庆市教委科学技术研究项目(KJ1401316);中国石油科技创新基金项目(2014D-5006-0108);重庆市自然科学基金项目(cstc2012jjA90007).

Sedimentary record and origin of high frequency cycles in the Paleogene Kongdian Formation in the Jiyang Depression

Tan Xianfeng^1,2, Jiang Yanxia³, Li Jie⁴, Xue Weiwei², Li Zemin²

1. Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development, Chongqing, 401331, China;
2. College of Oil and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
3. Earth Sciences faculty, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
4. Key Laboratory of Shale Gas Exploration, Ministry of Land and Resources, Chongqing 400042, China;
5. Chongqing Engineering Research Center for Shale Gas Resource & Exploration, Chongqing 400042, China

Received:2014-11-20 Revised:2014-12-08 Online:2015-02-08 Published:2015-02-11
Contact: 蒋艳霞(1989-), 女, 硕士研究生, 矿物学、岩石学、矿床学.E-mail:337008167@qq.com E-mail:337008167@qq.com

摘要/Abstract

摘要：

济阳坳陷古近系孔店组发育一套紫红色泥岩、灰色粉砂岩以及膏质泥岩等岩相组合的高频韵律旋回沉积。利用测井资料、录井剖面、岩心观察以及为地球化学元素等手段，对济阳坳陷古近系孔店组高频韵律旋回沉积机制进行了深入研究。结果表明，济阳坳陷孔店组旋回沉积记录包括颜色米级旋回、粒序米级旋回和非粒序米级旋回；发育6种岩相组合类型及23种岩相组合，共划分出276个米级旋回，旋回最大厚度为29.6 m，最小厚度为1.48 m，平均厚度为6.28 m；利用Fisher图解和测井曲线频谱分析，得出岁差周期为19.2～23.4 ka，斜率周期为39.1～51.4 ka,偏心率主要周期95.3～403.1 ka。该差值与古近纪超短期旋回、短期旋回和中期旋回的时间差基本一致，证实了孔店组湖泊相旋回沉积受控于米兰科维奇旋回。除此之外，旋回发育时期的古气候、沉积水介质的共轭震荡、物质供应等沉积动力因素也影响了旋回的发育过程。最后，建立了济阳坳陷古近系孔店组低水位干旱时期和高水位潮湿时期的旋回沉积动力模型，探讨了米兰科维奇旋回控制下旋回沉积的原始沉积动力和古环境面貌。

关键词: 高频旋回, 沉积机制, 孔店组, 古近系, 济阳坳陷

Abstract:

There is a set of high frequency cycles with lithological combination of purple red mudstone, grey siltstone and gypsiferous mudstone developing in the Kongdian Formation of Jiyang Depression.By using logging data, well logging, core observation and elemental geochemistry methods, this paper researched the deposition mechanism of high frequency cycles of the Kongdian Formation in Jiyang Depression.The research results show that the cyclic sedimentation record of Kongdian Formation in Jiyang Depression consist of color meter scale cycle, graded meter scale cycle, non-graded meter scale cycle and consist of 6 types of lithofacies assemblages which include 23 kinds of lithology combinations.The cyclic sedimentation record can be divided into 276 cycles, with the maximum thickness being 29.6m, the minimum thickness being 1.48m, and average thickness being 6.28m.Fisher diagrams and the spectrum analysis of logging curves reveal that the precession cycle is 19.2-23.4 ka, slope cycle is 39.1-51.4 ka, and eccentricity cycles is 95.3-403.1 ka.They are consistent with the period of ultra short term cycles, short-term cycle and medium-term cycles, respectively.So it is confirmed that the cyclic sedimentation record was controlled by the Milankovich cycle.In addition, it was also influenced by paleo-climate, sedimentary medium conjugate concussion and material supply.Finally, the cyclic-sedimentation dynamic model during low/high-stand period of Kongdian Formation in Jiyang Depression is established, and the original sedimentary dynamics and ancient environment of the cyclic sedimentation record under the control of Milankovich cycle are discussed.

Key words: high frequency cycle, deposition mechanism, Kongdian Formation, Palaeogene, Jiyang Depression

中图分类号:

TE121.3

谭先锋,蒋艳霞,李洁,等. 济阳坳陷古近系孔店组高频韵律旋回沉积记录及成因[J]. 石油与天然气地质, 2015, 36(1): 61-72. doi: 10.11743/ogg20150108 Tan Xianfeng,Jiang Yanxia,Li Jie,et al. Sedimentary record and origin of high frequency cycles in the Paleogene Kongdian Formation in the Jiyang Depression[J]. Oil & Gas Geology, 2015, 36(1): 61-72. doi: 10.11743/ogg20150108

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济阳坳陷古近系孔店组高频韵律旋回沉积记录及成因

Sedimentary record and origin of high frequency cycles in the Paleogene Kongdian Formation in the Jiyang Depression

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